/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.commons.consensus;

import org.apache.iotdb.common.rpc.thrift.TConsensusGroupId;
import org.apache.iotdb.common.rpc.thrift.TConsensusGroupType;

import java.util.Objects;

// we abstract this class to hide word `ConsensusGroup` for IoTDB StorageEngine/SchemaEngine
public abstract class ConsensusGroupId {

    protected int id;

    // return specific id
    public int getId() {
        return id;
    }

    // return specific type
    public abstract TConsensusGroupType getType();

    public TConsensusGroupId convertToTConsensusGroupId() {
        return new TConsensusGroupId(getType(), getId());
    }

    @Override
    public int hashCode() {
        return Objects.hash(getType(), getId());
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        ConsensusGroupId that = (ConsensusGroupId) o;
        return getId() == that.getId() && getType() == that.getType();
    }

    @Override
    public String toString() {
        return String.format("%s[%d]", getType(), getId());
    }

    public static class Factory {

        public static ConsensusGroupId create(int type, int id) {
            ConsensusGroupId groupId;
            if (type == TConsensusGroupType.DataRegion.getValue()) {
                groupId = new DataRegionId(id);
            } else if (type == TConsensusGroupType.SchemaRegion.getValue()) {
                groupId = new SchemaRegionId(id);
            } else if (type == TConsensusGroupType.ConfigNodeRegion.getValue()) {
                groupId = new ConfigNodeRegionId(id);
            } else {
                throw new IllegalArgumentException(
                        "Unrecognized TConsensusGroupType: " + type + " with id = " + id);
            }
            return groupId;
        }

        public static ConsensusGroupId createFromTConsensusGroupId(
                TConsensusGroupId tConsensusGroupId) {
            return create(tConsensusGroupId.getType().getValue(), tConsensusGroupId.getId());
        }
    }

    public static String formatTConsensusGroupId(TConsensusGroupId groupId) {
        StringBuilder format = new StringBuilder();

        switch (groupId.getType()) {
            case SchemaRegion:
                format.append("SchemaRegion");
                break;
            case DataRegion:
                format.append("DataRegion");
                break;
            case ConfigNodeRegion:
                format.append("ConfigNodeRegion");
                break;
        }

        format.append("(").append(groupId.getId()).append(")");

        return format.toString();
    }
}
